Squashed 'third_party/rawrtc/re/' content from commit f3163ce8b
Change-Id: I6a235e6ac0f03269d951026f9d195da05c40fdab
git-subtree-dir: third_party/rawrtc/re
git-subtree-split: f3163ce8b526a13b35ef71ce4dd6f43585064d8a
diff --git a/src/rtp/ntp.c b/src/rtp/ntp.c
new file mode 100644
index 0000000..ab5494b
--- /dev/null
+++ b/src/rtp/ntp.c
@@ -0,0 +1,103 @@
+/**
+ * @file ntp.c NTP Routines
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#else
+#include <time.h>
+#endif
+#include <re_types.h>
+#include <re_fmt.h>
+#include <re_list.h>
+#include <re_sa.h>
+#include <re_rtp.h>
+#include "rtcp.h"
+
+
+/*
+ * Unix time: seconds relative to 0h January 1, 1970
+ * NTP time: seconds relative to 0h UTC on 1 January 1900
+ */
+
+
+/* Number of seconds from 1900 to 1970 */
+#define UNIX_NTP_OFFSET 0x83aa7e80
+
+
+/**
+ * Convert from Unix time to NTP time
+ *
+ * @param ntp NTP time to convert to (output)
+ * @param tv Unix time to convert from (input)
+ */
+void unix2ntp(struct ntp_time *ntp, const struct timeval *tv)
+{
+ ntp->hi = (uint32_t)(tv->tv_sec + UNIX_NTP_OFFSET);
+ ntp->lo = (uint32_t)((double)tv->tv_usec*(double)(1LL<<32)*1.0e-6);
+}
+
+
+/**
+ * Convert from NTP time to Unix time
+ *
+ * @param tv Unix time to convert to (output)
+ * @param ntp NTP time to convert from (input)
+ */
+void ntp2unix(struct timeval *tv, const struct ntp_time *ntp)
+{
+ tv->tv_sec = ntp->hi - UNIX_NTP_OFFSET;
+ tv->tv_usec = (uint32_t)(1.0e6 * (double) ntp->lo / (1LL<<32));
+}
+
+
+int ntp_time_get(struct ntp_time *ntp)
+{
+ struct timeval tv;
+#ifdef WIN32
+ union {
+ long long ns100;
+ FILETIME ft;
+ } now;
+
+ GetSystemTimeAsFileTime(&now.ft);
+ tv.tv_usec = (long) ((now.ns100 / 10LL) % 1000000LL);
+ tv.tv_sec = (long) ((now.ns100 - 116444736000000000LL) / 10000000LL);
+#else
+ if (gettimeofday(&tv, NULL) != 0)
+ return errno;
+#endif
+ unix2ntp(ntp, &tv);
+
+ return 0;
+}
+
+
+/**
+ * Convert NTP time to middle 32-bits (compact representation)
+ *
+ * @param ntp NTP time
+ *
+ * @return NTP time in compact representation
+ */
+uint32_t ntp_compact(const struct ntp_time *ntp)
+{
+ return ntp ? ((ntp->hi & 0xffff) << 16 | (ntp->lo >> 16)) : 0;
+}
+
+
+/**
+ * Convert NTP compact representation to microseconds
+ *
+ * @param ntpc NTP time in compact representation
+ *
+ * @return NTP time in microseconds
+ */
+uint64_t ntp_compact2us(uint32_t ntpc)
+{
+ const uint32_t hi = (ntpc >> 16) & 0xffff;
+ const uint32_t lo = (ntpc & 0xffff) << 16;
+
+ return (1000000ULL * hi) + ((1000000ULL * lo) >> 32);
+}